1 /*
   2  * Copyright (c) 2015, 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 package org.graalvm.compiler.lir.amd64;
  24 
  25 import static org.graalvm.compiler.lir.LIRInstruction.OperandFlag.REG;
  26 import jdk.vm.ci.amd64.AMD64;
  27 import jdk.vm.ci.amd64.AMD64Kind;
  28 import jdk.vm.ci.meta.AllocatableValue;
  29 
  30 import org.graalvm.compiler.asm.amd64.AMD64MacroAssembler;
  31 import org.graalvm.compiler.core.common.LIRKind;
  32 import org.graalvm.compiler.lir.LIRInstructionClass;
  33 import org.graalvm.compiler.lir.Opcode;
  34 import org.graalvm.compiler.lir.asm.CompilationResultBuilder;
  35 
  36 /**
  37  * AMD64 rdtsc operation. The result is in EDX:EAX.
  38  */
  39 @Opcode("RDTSC")
  40 public class AMD64ReadTimestampCounter extends AMD64LIRInstruction {
  41     public static final LIRInstructionClass<AMD64ReadTimestampCounter> TYPE = LIRInstructionClass.create(AMD64ReadTimestampCounter.class);
  42 
  43     @Def({REG}) protected AllocatableValue highResult;
  44     @Def({REG}) protected AllocatableValue lowResult;
  45 
  46     public AMD64ReadTimestampCounter() {
  47         super(TYPE);
  48 
  49         this.highResult = AMD64.rdx.asValue(LIRKind.value(AMD64Kind.DWORD));
  50         this.lowResult = AMD64.rax.asValue(LIRKind.value(AMD64Kind.DWORD));
  51     }
  52 
  53     public AllocatableValue getHighResult() {
  54         return highResult;
  55     }
  56 
  57     public AllocatableValue getLowResult() {
  58         return lowResult;
  59     }
  60 
  61     @Override
  62     public void emitCode(CompilationResultBuilder crb, AMD64MacroAssembler masm) {
  63         masm.rdtsc();
  64     }
  65 }